Sodium chloride efflorescence on side of brick with desalination
compress on top. Note apparent migration of salts from surface
to side due to preferential drying. Photo: Stefan Simon.

Taking drill powder profiles in order to determine the distribution
of salts for controlling the desalination efficiency. Photo:
Stefan Simon.

Application of poultices on salt-laden bricks in order to
test their salt uptake and degree of desalination. Photo:
Stefan Simon.

A series of electron micrographs illustratingat progressively
higher magnificationthe presence of small salt crystals
adjacent to fracture surfaces in limestone. The salt crystals'
shape and location provide evidence of how damage takes place.
The smallest features visible in these images are less than
1/10,000 of a millimeter in size. Photos: Eric Doehne.